Boost C++ Libraries

Parses OGC Well-Known Text (WKT (Well-Known Text)) into a geometry (any geometry) and returns it.

Synopsis

template<typename Geometry>
Geometry from_wkt(std::string const & wkt)

Parameters

Header

Either

#include <boost/geometry.hpp>

Or

#include <boost/geometry/io/wkt/read.hpp>

Conformance

Other libraries refer to this functionality as ST_GeomFromText or STGeomFromText. That is not done here because Boost.Geometry support more text formats. The name GeomFromText is reserved for future usage, which will then have an indication of the used text format.

Example

Shows the usage of from_wkt

#include <boost/geometry.hpp>
#include <boost/geometry/geometries/point_xy.hpp>
#include <boost/geometry/geometries/linestring.hpp>
#include <boost/geometry/geometries/polygon.hpp>

int main()
{
    using point_type = boost::geometry::model::d2::point_xy<double>;
    using box_type = boost::geometry::model::box<point_type>;
    using segment_type = boost::geometry::model::segment<point_type>;
    using polygon_type = boost::geometry::model::polygon<point_type>;
    using linestring_type = boost::geometry::model::linestring<point_type>;

    auto const a = boost::geometry::from_wkt<point_type>("POINT(1 2)");
    auto const d = boost::geometry::from_wkt<box_type>("BOX(0 0,3 3)");
    auto const e = boost::geometry::from_wkt<segment_type>("SEGMENT(1 0,3 4)");
    auto const c = boost::geometry::from_wkt<polygon_type>("POLYGON((0 0,0 7,4 2,2 0,0 0))");
    auto const b = boost::geometry::from_wkt<linestring_type>("LINESTRING(0 0,2 2,3 1)");

    return 0;
}

See also